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Theorem algcvga 16549

Description: The countdown function 𝐶 remains 0 after 𝑁 steps. (Contributed by Paul Chapman, 22-Jun-2011.)

**Hypotheses**
Ref	Expression
algcvga.1	⊢ 𝐹:𝑆⟶𝑆
algcvga.2	⊢ 𝑅 = seq0((𝐹 ∘ 1^st ), (ℕ₀ × {𝐴}))
algcvga.3	⊢ 𝐶:𝑆⟶ℕ₀
algcvga.4	⊢ (𝑧 ∈ 𝑆 → ((𝐶‘(𝐹‘𝑧)) ≠ 0 → (𝐶‘(𝐹‘𝑧)) < (𝐶‘𝑧)))
algcvga.5	⊢ 𝑁 = (𝐶‘𝐴)

**Assertion**
Ref	Expression
algcvga	⊢ (𝐴 ∈ 𝑆 → (𝐾 ∈ (ℤ_≥‘𝑁) → (𝐶‘(𝑅‘𝐾)) = 0))

Distinct variable groups: 𝑧,𝐶 𝑧,𝐹 𝑧,𝑅 𝑧,𝑆 Allowed substitution hints: 𝐴(𝑧) 𝐾(𝑧) 𝑁(𝑧)

Proof of Theorem algcvga Dummy variables 𝑘 𝑚 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		algcvga.5	. . 3 ⊢ 𝑁 = (𝐶‘𝐴)
2		algcvga.3	. . . 4 ⊢ 𝐶:𝑆⟶ℕ₀
3	2	ffvelcdmi 7090	. . 3 ⊢ (𝐴 ∈ 𝑆 → (𝐶‘𝐴) ∈ ℕ₀)
4	1, 3	eqeltrid 2829	. 2 ⊢ (𝐴 ∈ 𝑆 → 𝑁 ∈ ℕ₀)
5		nn0z 12613	. . . 4 ⊢ (𝑁 ∈ ℕ₀ → 𝑁 ∈ ℤ)
6		eluz1 12856	. . . . 5 ⊢ (𝑁 ∈ ℤ → (𝐾 ∈ (ℤ_≥‘𝑁) ↔ (𝐾 ∈ ℤ ∧ 𝑁 ≤ 𝐾)))
7		2fveq3 6899	. . . . . . . . 9 ⊢ (𝑚 = 𝑁 → (𝐶‘(𝑅‘𝑚)) = (𝐶‘(𝑅‘𝑁)))
8	7	eqeq1d 2727	. . . . . . . 8 ⊢ (𝑚 = 𝑁 → ((𝐶‘(𝑅‘𝑚)) = 0 ↔ (𝐶‘(𝑅‘𝑁)) = 0))
9	8	imbi2d 339	. . . . . . 7 ⊢ (𝑚 = 𝑁 → ((𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝑚)) = 0) ↔ (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝑁)) = 0)))
10		2fveq3 6899	. . . . . . . . 9 ⊢ (𝑚 = 𝑘 → (𝐶‘(𝑅‘𝑚)) = (𝐶‘(𝑅‘𝑘)))
11	10	eqeq1d 2727	. . . . . . . 8 ⊢ (𝑚 = 𝑘 → ((𝐶‘(𝑅‘𝑚)) = 0 ↔ (𝐶‘(𝑅‘𝑘)) = 0))
12	11	imbi2d 339	. . . . . . 7 ⊢ (𝑚 = 𝑘 → ((𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝑚)) = 0) ↔ (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝑘)) = 0)))
13		2fveq3 6899	. . . . . . . . 9 ⊢ (𝑚 = (𝑘 + 1) → (𝐶‘(𝑅‘𝑚)) = (𝐶‘(𝑅‘(𝑘 + 1))))
14	13	eqeq1d 2727	. . . . . . . 8 ⊢ (𝑚 = (𝑘 + 1) → ((𝐶‘(𝑅‘𝑚)) = 0 ↔ (𝐶‘(𝑅‘(𝑘 + 1))) = 0))
15	14	imbi2d 339	. . . . . . 7 ⊢ (𝑚 = (𝑘 + 1) → ((𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝑚)) = 0) ↔ (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘(𝑘 + 1))) = 0)))
16		2fveq3 6899	. . . . . . . . 9 ⊢ (𝑚 = 𝐾 → (𝐶‘(𝑅‘𝑚)) = (𝐶‘(𝑅‘𝐾)))
17	16	eqeq1d 2727	. . . . . . . 8 ⊢ (𝑚 = 𝐾 → ((𝐶‘(𝑅‘𝑚)) = 0 ↔ (𝐶‘(𝑅‘𝐾)) = 0))
18	17	imbi2d 339	. . . . . . 7 ⊢ (𝑚 = 𝐾 → ((𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝑚)) = 0) ↔ (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝐾)) = 0)))
19		algcvga.1	. . . . . . . . 9 ⊢ 𝐹:𝑆⟶𝑆
20		algcvga.2	. . . . . . . . 9 ⊢ 𝑅 = seq0((𝐹 ∘ 1^st ), (ℕ₀ × {𝐴}))
21		algcvga.4	. . . . . . . . 9 ⊢ (𝑧 ∈ 𝑆 → ((𝐶‘(𝐹‘𝑧)) ≠ 0 → (𝐶‘(𝐹‘𝑧)) < (𝐶‘𝑧)))
22	19, 20, 2, 21, 1	algcvg 16546	. . . . . . . 8 ⊢ (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝑁)) = 0)
23	22	a1i 11	. . . . . . 7 ⊢ (𝑁 ∈ ℤ → (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝑁)) = 0))
24		nn0ge0 12527	. . . . . . . . . . . . . . . . 17 ⊢ (𝑁 ∈ ℕ₀ → 0 ≤ 𝑁)
25	24	adantr 479	. . . . . . . . . . . . . . . 16 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑘 ∈ ℤ) → 0 ≤ 𝑁)
26		0re 11246	. . . . . . . . . . . . . . . . 17 ⊢ 0 ∈ ℝ
27		nn0re 12511	. . . . . . . . . . . . . . . . 17 ⊢ (𝑁 ∈ ℕ₀ → 𝑁 ∈ ℝ)
28		zre 12592	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 ∈ ℤ → 𝑘 ∈ ℝ)
29		letr 11338	. . . . . . . . . . . . . . . . 17 ⊢ ((0 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝑘 ∈ ℝ) → ((0 ≤ 𝑁 ∧ 𝑁 ≤ 𝑘) → 0 ≤ 𝑘))
30	26, 27, 28, 29	mp3an3an 1463	. . . . . . . . . . . . . . . 16 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑘 ∈ ℤ) → ((0 ≤ 𝑁 ∧ 𝑁 ≤ 𝑘) → 0 ≤ 𝑘))
31	25, 30	mpand 693	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑘 ∈ ℤ) → (𝑁 ≤ 𝑘 → 0 ≤ 𝑘))
32		elnn0z 12601	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 ∈ ℕ₀ ↔ (𝑘 ∈ ℤ ∧ 0 ≤ 𝑘))
33	32	simplbi2 499	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 ∈ ℤ → (0 ≤ 𝑘 → 𝑘 ∈ ℕ₀))
34	33	adantl 480	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑘 ∈ ℤ) → (0 ≤ 𝑘 → 𝑘 ∈ ℕ₀))
35	31, 34	syld 47	. . . . . . . . . . . . . 14 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑘 ∈ ℤ) → (𝑁 ≤ 𝑘 → 𝑘 ∈ ℕ₀))
36	4, 35	sylan 578	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℤ) → (𝑁 ≤ 𝑘 → 𝑘 ∈ ℕ₀))
37	36	impr 453	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ 𝑆 ∧ (𝑘 ∈ ℤ ∧ 𝑁 ≤ 𝑘)) → 𝑘 ∈ ℕ₀)
38	37	expcom 412	. . . . . . . . . . 11 ⊢ ((𝑘 ∈ ℤ ∧ 𝑁 ≤ 𝑘) → (𝐴 ∈ 𝑆 → 𝑘 ∈ ℕ₀))
39	38	3adant1 1127	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ 𝑁 ≤ 𝑘) → (𝐴 ∈ 𝑆 → 𝑘 ∈ ℕ₀))
40	39	ancld 549	. . . . . . . . 9 ⊢ ((𝑁 ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ 𝑁 ≤ 𝑘) → (𝐴 ∈ 𝑆 → (𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ₀)))
41		nn0uz 12894	. . . . . . . . . . . . 13 ⊢ ℕ₀ = (ℤ_≥‘0)
42		0zd 12600	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ 𝑆 → 0 ∈ ℤ)
43		id 22	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ 𝑆 → 𝐴 ∈ 𝑆)
44	19	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ 𝑆 → 𝐹:𝑆⟶𝑆)
45	41, 20, 42, 43, 44	algrf 16543	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ 𝑆 → 𝑅:ℕ₀⟶𝑆)
46	45	ffvelcdmda 7091	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ₀) → (𝑅‘𝑘) ∈ 𝑆)
47		2fveq3 6899	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = (𝑅‘𝑘) → (𝐶‘(𝐹‘𝑧)) = (𝐶‘(𝐹‘(𝑅‘𝑘))))
48	47	neeq1d 2990	. . . . . . . . . . . . . 14 ⊢ (𝑧 = (𝑅‘𝑘) → ((𝐶‘(𝐹‘𝑧)) ≠ 0 ↔ (𝐶‘(𝐹‘(𝑅‘𝑘))) ≠ 0))
49		fveq2 6894	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = (𝑅‘𝑘) → (𝐶‘𝑧) = (𝐶‘(𝑅‘𝑘)))
50	47, 49	breq12d 5161	. . . . . . . . . . . . . 14 ⊢ (𝑧 = (𝑅‘𝑘) → ((𝐶‘(𝐹‘𝑧)) < (𝐶‘𝑧) ↔ (𝐶‘(𝐹‘(𝑅‘𝑘))) < (𝐶‘(𝑅‘𝑘))))
51	48, 50	imbi12d 343	. . . . . . . . . . . . 13 ⊢ (𝑧 = (𝑅‘𝑘) → (((𝐶‘(𝐹‘𝑧)) ≠ 0 → (𝐶‘(𝐹‘𝑧)) < (𝐶‘𝑧)) ↔ ((𝐶‘(𝐹‘(𝑅‘𝑘))) ≠ 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) < (𝐶‘(𝑅‘𝑘)))))
52	51, 21	vtoclga 3557	. . . . . . . . . . . 12 ⊢ ((𝑅‘𝑘) ∈ 𝑆 → ((𝐶‘(𝐹‘(𝑅‘𝑘))) ≠ 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) < (𝐶‘(𝑅‘𝑘))))
53	19, 2	algcvgb 16548	. . . . . . . . . . . . 13 ⊢ ((𝑅‘𝑘) ∈ 𝑆 → (((𝐶‘(𝐹‘(𝑅‘𝑘))) ≠ 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) < (𝐶‘(𝑅‘𝑘))) ↔ (((𝐶‘(𝑅‘𝑘)) ≠ 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) < (𝐶‘(𝑅‘𝑘))) ∧ ((𝐶‘(𝑅‘𝑘)) = 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) = 0))))
54		simpr 483	. . . . . . . . . . . . 13 ⊢ ((((𝐶‘(𝑅‘𝑘)) ≠ 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) < (𝐶‘(𝑅‘𝑘))) ∧ ((𝐶‘(𝑅‘𝑘)) = 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) = 0)) → ((𝐶‘(𝑅‘𝑘)) = 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) = 0))
55	53, 54	biimtrdi 252	. . . . . . . . . . . 12 ⊢ ((𝑅‘𝑘) ∈ 𝑆 → (((𝐶‘(𝐹‘(𝑅‘𝑘))) ≠ 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) < (𝐶‘(𝑅‘𝑘))) → ((𝐶‘(𝑅‘𝑘)) = 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) = 0)))
56	52, 55	mpd 15	. . . . . . . . . . 11 ⊢ ((𝑅‘𝑘) ∈ 𝑆 → ((𝐶‘(𝑅‘𝑘)) = 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) = 0))
57	46, 56	syl 17	. . . . . . . . . 10 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ₀) → ((𝐶‘(𝑅‘𝑘)) = 0 → (𝐶‘(𝐹‘(𝑅‘𝑘))) = 0))
58	41, 20, 42, 43, 44	algrp1 16544	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ₀) → (𝑅‘(𝑘 + 1)) = (𝐹‘(𝑅‘𝑘)))
59	58	fveqeq2d 6902	. . . . . . . . . 10 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ₀) → ((𝐶‘(𝑅‘(𝑘 + 1))) = 0 ↔ (𝐶‘(𝐹‘(𝑅‘𝑘))) = 0))
60	57, 59	sylibrd 258	. . . . . . . . 9 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝑘 ∈ ℕ₀) → ((𝐶‘(𝑅‘𝑘)) = 0 → (𝐶‘(𝑅‘(𝑘 + 1))) = 0))
61	40, 60	syl6 35	. . . . . . . 8 ⊢ ((𝑁 ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ 𝑁 ≤ 𝑘) → (𝐴 ∈ 𝑆 → ((𝐶‘(𝑅‘𝑘)) = 0 → (𝐶‘(𝑅‘(𝑘 + 1))) = 0)))
62	61	a2d 29	. . . . . . 7 ⊢ ((𝑁 ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ 𝑁 ≤ 𝑘) → ((𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝑘)) = 0) → (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘(𝑘 + 1))) = 0)))
63	9, 12, 15, 18, 23, 62	uzind 12684	. . . . . 6 ⊢ ((𝑁 ∈ ℤ ∧ 𝐾 ∈ ℤ ∧ 𝑁 ≤ 𝐾) → (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝐾)) = 0))
64	63	3expib 1119	. . . . 5 ⊢ (𝑁 ∈ ℤ → ((𝐾 ∈ ℤ ∧ 𝑁 ≤ 𝐾) → (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝐾)) = 0)))
65	6, 64	sylbid 239	. . . 4 ⊢ (𝑁 ∈ ℤ → (𝐾 ∈ (ℤ_≥‘𝑁) → (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝐾)) = 0)))
66	5, 65	syl 17	. . 3 ⊢ (𝑁 ∈ ℕ₀ → (𝐾 ∈ (ℤ_≥‘𝑁) → (𝐴 ∈ 𝑆 → (𝐶‘(𝑅‘𝐾)) = 0)))
67	66	com3r 87	. 2 ⊢ (𝐴 ∈ 𝑆 → (𝑁 ∈ ℕ₀ → (𝐾 ∈ (ℤ_≥‘𝑁) → (𝐶‘(𝑅‘𝐾)) = 0)))
68	4, 67	mpd 15	1 ⊢ (𝐴 ∈ 𝑆 → (𝐾 ∈ (ℤ_≥‘𝑁) → (𝐶‘(𝑅‘𝐾)) = 0))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2930 {csn 4629 class class class wbr 5148 × cxp 5675 ∘ ccom 5681 ⟶wf 6543 ‘cfv 6547 (class class class)co 7417 1^st c1st 7990 ℝcr 11137 0cc0 11138 1c1 11139 + caddc 11141 < clt 11278 ≤ cle 11279 ℕ₀cn0 12502 ℤcz 12588 ℤ_≥cuz 12852 seqcseq 13998

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-sep 5299 ax-nul 5306 ax-pow 5364 ax-pr 5428 ax-un 7739 ax-cnex 11194 ax-resscn 11195 ax-1cn 11196 ax-icn 11197 ax-addcl 11198 ax-addrcl 11199 ax-mulcl 11200 ax-mulrcl 11201 ax-mulcom 11202 ax-addass 11203 ax-mulass 11204 ax-distr 11205 ax-i2m1 11206 ax-1ne0 11207 ax-1rid 11208 ax-rnegex 11209 ax-rrecex 11210 ax-cnre 11211 ax-pre-lttri 11212 ax-pre-lttrn 11213 ax-pre-ltadd 11214 ax-pre-mulgt0 11215

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3775 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3965 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6499 df-fun 6549 df-fn 6550 df-f 6551 df-f1 6552 df-fo 6553 df-f1o 6554 df-fv 6555 df-riota 7373 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7870 df-1st 7992 df-2nd 7993 df-frecs 8285 df-wrecs 8316 df-recs 8390 df-rdg 8429 df-er 8723 df-en 8963 df-dom 8964 df-sdom 8965 df-pnf 11280 df-mnf 11281 df-xr 11282 df-ltxr 11283 df-le 11284 df-sub 11476 df-neg 11477 df-nn 12243 df-n0 12503 df-z 12589 df-uz 12853 df-fz 13517 df-seq 13999

This theorem is referenced by: algfx 16550 eucalgcvga 16556

W3C validator